Groove the pattern: the target heads it down to the edge, the striker times his arrival and finishes first time and low, no pressure.
As the second-ball corner but with no defender. Deliver to the target, who heads it down to the top of the box; the midfielder times his run and strikes it first time and low. Focus purely on the header down, the timing of the run, and a clean, low contact. Add the defender once the pattern is grooved.
Fork it into your private drills, then change the animation, adjust positions, swap equipment, or drop it into a session block.